In the early Meiji era, against civil unrest and the end of the samurai way of life, Japan's crime rate skyrocketed. As prisons overflow, the government has no choice but to build a new, inescapable prison. This prison is Gokumonjo, located in the center of Lake Biwa, which means it relies on the three sons of the Kumo family to transport criminals to it. But is Gokumonjo truly just a prison for petty criminals...?

Under the curse of Orochi, the great demon serpent reborn every 300 years, Japan has been shrouded in clouds for as long as anyone can remember... The era of the samurai is at an end, and carrying swords has been outlawed. To combat the rising crime rates, an inescapable prison was built in the middle of Lake Biwa. When brothers Tenka, Soramaru and Chutaro Kumo are hired to capture and transport offenders to their final lodgings in this prison, they unexpectedly find themselves faced with a greater destiny than any of them could have imagined.

Soramaru's quest to grow stronger brings him to the leader of the Yamainu, Abe no Sousei. Sousei proposes a trade: training in exchange for information. In search of the information required, Soramaru disguises himself and — with the help of youngest brother Chutaro — infiltrates the very prison he's taken so many criminals to: Gokumonjo. But nothing is ever as easy as it seems, and although Soramaru finds the information he needs to make a deal, eldest Kumo brother Tenka suddenly finds himself under arrest and in dire straits...

In the early Meiji era, against civil unrest and the end of the samurai way of life, Japan's crime rate skyrocketed. As prisons overflow, the government has no choice but to build a new, inescapable prison. This prison is Gokumonjo, located in the center of Lake Biwa, which means it relies on the three sons of the Kumo family to transport criminals to it. But is Gokumonjo truly just a prison for petty criminals...?

Legends say that Senzou the Black Fox is one of the most vicious and powerful supernatural beasts to ever roam the land. At least, he used to be. Now, 300 years after he was imprisoned by the Sun Goddess for his bad behavior, Senzou is back — in the form of a small black fox with no powers! Tasked with protecting a young tanuki called Manpachi as he fulfills various tasks for the gods, Senzou must earn his powers back by learning how to be a good guardian to the energetic little pup. Though Senzou is a grumpy and reluctant companion at first, even a hard-hearted fox can be tamed by cuteness... and the little tanuki quickly learns there are some family ties that aren't decided by blood.

When Lizel mysteriously finds himself in a city that bears odd similarities to his own but clearly isn't, he quickly comes to terms with the unlikely truth: this is an entirely different world. Even so, laid-back Lizel isn't the type to panic. He immediately sets out to learn more about this strange place, and to help him do so, hires a seasoned adventurer named Gil as his tour guide and protector. Until he's able to find a way home, Lizel figures this is a perfect opportunity to explore a new way of life adventuring as part of a guild. After all, he's sure he'll go home eventually... might as well enjoy the otherworldly vacation for now!

Soramaru's quest to grow stronger brings him to the leader of the Yamainu, Abe no Sousei. Sousei proposes a trade: training in exchange for information. In search of the information required, Soramaru disguises himself and - with the help of youngest brother Chutaro - infiltrates the very prison he's taken so many criminals to: Gokumonjo. But nothing is ever as easy as it seems, and although Soramaru finds the information he needs to make a deal, eldest Kumo brother Tenka suddenly finds himself under arrest and in dire straits...